What's the noun for pyritization? Here's the word you're looking for.
pyrite
(mineralogy) The common mineralirondisulfide (FeS2), of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system.
(usually as a plural: pyrites) Any metallic-looking sulphide, such as the above, which is the most common.
(chemistry) (usually as a plural: pyrites) Any metal dichalcogenide that is isostructural to the common mineral.